排污活动对长江口滨岸潮滩营养元素N累积运移的影响及作用机制

doi:10.13249/j.cnki.sgs.2007.05.695

地理科学 ›› 2007, Vol. 27 ›› Issue (5): 695-700.doi: 10.13249/j.cnki.sgs.2007.05.695

排污活动对长江口滨岸潮滩营养元素N累积运移的影响及作用机制

付金沐^1,2, 刘敏¹, 侯立军¹, 欧冬妮¹, 刘巧梅¹

1. 华东师范大学地理系地理信息科学教育部重点实验室上海 200062;
2. 宿州学院地理环境科学系安徽宿州 234000

收稿日期:2006-05-23 修回日期:2006-10-23 出版日期:2007-09-20 发布日期:2007-09-20
基金资助:
国家自然科学基金项目(40131020,49801018);教育部高等学校骨干教师计划项目;上海市重点学科建设项目(SHPAD-01)资助

Impacts of Sewage Discharge on Accumulation and Transport of Nitrogen in Tidal Flats of Changjiang River Estuary and Its Mechanisms

FU Jin-Mu^1,2, LIU Min¹, HOU Li-Jun¹, OU Dong-Ni¹, LIU Qiao-Mei¹

1. Department of Geography, Key Laboratory of Geo-information Science of the Ministry of Education, East China Normal University, Shanghai 200062;
2. Department of Geographical and Environmental Science, Suzhou College, Suzhou, Anhui 234000

Received:2006-05-23 Revised:2006-10-23 Online:2007-09-20 Published:2007-09-20

摘要/Abstract

摘要： 选择长江口滨岸潮滩作为典型研究区,研究了排污活动对潮滩营养盐N环境地球化学过程的影响。结果发现排污口滨岸潮滩上覆水、表层沉积物孔隙水和表层沉积物中的NH₄⁺-N、TIN等都有显著累积效应,而NO_x^--N在长江口滨岸潮滩上覆水、表层沉积物孔隙水和表层沉积物中并未出现累积高峰值,表明外源输入不是潮滩环境中NO_x^--N主要来源。分析结果还显示,排污口潮滩沉积物-水界面间N分子扩散通量明显大于非排污口,表明排污活动加剧了潮滩沉积物-水界面间营养盐N的扩散过程。

Abstract: The influences of sewage discharge on environmental geo-chemical processes of nutrients were investigated in the Changjiang(Yangtze) River estuary in this study.The result indicates that there was obviously enrichment of NH₄⁺-N and TIN in tidal water,tidal surface-sediment pore waters and surface sediments adjacent to sewage outlets in the estuary.The enrichment of nitrogen was considered to be related not only to the inputs of nitrogen from sewage outlets,but also to the changes of environmental factors induced by sewage discharge.In contrast,there was no significant enrichment of NO_x^-—N in the tidal water,tidal surface-sediment pore waters and surface sediments from the estuary,which showed that external inputs of nutrients was not the primary factor controlling the distribution of NO_x^-—N.It was also shown that the diffusive fluxes of nitrogen across sediment-water interface was markedly higher at sewage outlets than at the control sampling sites in tidal flats,indicating that sewage discharge not only increased the accumulation of nitrogen in the tidal flat,but also strengthened the exchange process of nitrogen across tidal sediment-water interface.

中图分类号:

X821/827

付金沐, 刘敏, 侯立军, 欧冬妮, 刘巧梅. 排污活动对长江口滨岸潮滩营养元素N累积运移的影响及作用机制[J]. 地理科学, 2007, 27(5): 695-700.

FU Jin-Mu, LIU Min, HOU Li-Jun, OU Dong-Ni, LIU Qiao-Mei. Impacts of Sewage Discharge on Accumulation and Transport of Nitrogen in Tidal Flats of Changjiang River Estuary and Its Mechanisms[J]. SCIENTIA GEOGRAPHICA SINICA, 2007, 27(5): 695-700.

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排污活动对长江口滨岸潮滩营养元素N累积运移的影响及作用机制

Impacts of Sewage Discharge on Accumulation and Transport of Nitrogen in Tidal Flats of Changjiang River Estuary and Its Mechanisms

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